We report on the experimental observation of multi-wavelength operations based on the evanescent-field interaction with carbon nanotubes (CNTs). The saturable absorber (SA) is fabricated by depositing CNTs on a D-shaped fiber (DF). In the experiment, switchable dual-wavelength picosecond solitons with central wavelengths of 1532.2, 1556.6 nm and 1529.4, 1531.0 nm are achieved. Several single wavelength operations are also delivered by the all-fiber laser. Single-and multi-wavelength pulse emissions are effectively controlled by changing the pump power and optimizing the polarization controller. Our experiment demonstrates that the DF-SA can work as a versatile mode locker in ultrafast lasers. The flexible all-fiber laser is convenient and attractive for practical applications such as fiber optic sensing and photonic component characterization.
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